title: Predicting need for hospitalization in acute pediatric asthma.
abstract: OBJECTIVE
  To develop and validate predictive models to determine the need for hospitalization in children treated for acute asthma in the emergency department (ED).
  
  
  METHODS
  Prospective cohort study of children aged 2 years and older treated at 2 pediatric EDs for acute asthma. The primary outcome was successful ED discharge, defined as actual discharge from the ED and no readmission for asthma within 7 days, versus need for extended care. Among those defined as requiring extended care, a secondary outcome of inpatient care (>24 hours) or short-stay care (<24 hours) was defined. Logistic regression and recursive partitioning were used to create predictive models based on historical and clinical data from the ED visit. Models were developed with data from 1 ED and validated in the other.
  
  
  RESULTS
  There were 852 subjects in the derivation group and 369 in the validation group. A model including clinical score (Pediatric Asthma Severity Score) and number of albuterol treatments in the ED distinguished successful discharge from need for extended care with an area under the receiver-operator characteristic curve of 0.89 (95% confidence interval [CI], 0.87-0.92) in the derivation group and 0.92 (95% CI, 0.89-0.95) in the validation group. Using a score of 5 or more as a cutoff, the likelihood ratio positive was 5.2 (95% CI, 4.2-6.5), and the likelihood ratio negative was 0.22 (95% CI, 0.17-0.28). Among those predicted to need extended care, a classification tree using number of treatments in the ED, clinical score at end of ED treatment, and initial pulse oximetry correctly classified 63% (95% CI, 56-70) of the derivation group as short stay or inpatient, and 62% (95% CI, 55-68) of the validation group.
  
  
  CONCLUSIONS
  Successful discharge from the ED for children with acute asthma can be predicted accurately using a simple clinical model, potentially improving disposition decisions. However, predicting correct placement of patients requiring extended care is problematic.
authors.affiliation: Department of Pediatrics, Medical College of Wisconsin and Children's Research Institute, Milwaukee, WI, USA. mgorelic@mcw.edu
authors.forename: Marc
authors.initials: M
authors.lastname: Gorelick
authors.forename: Philip V
authors.initials: PV
authors.lastname: Scribano
authors.forename: Martha W
authors.initials: MW
authors.lastname: Stevens
authors.forename: Theresa
authors.initials: T
authors.lastname: Schultz
authors.forename: Justine
authors.initials: J
authors.lastname: Shults
mesh_terms: D000208:Acute Disease; D000293:Adolescent; D018927:Anti-Asthmatic Agents / Q000008:administration & dosage; D001249:Asthma / Q000175:diagnosis* / Q000453:epidemiology / Q000628:therapy*; D002648:Child; D002675:Child, Preschool; D015331:Cohort Studies; D004636:Emergency Service, Hospital / Q000706:statistics & numerical data*; D004638:Emergency Treatment / Q000379:methods / Q000706:statistics & numerical data; D005260:Female; D005500:Follow-Up Studies; D006760:Hospitalization / Q000706:statistics & numerical data*; D006776:Hospitals, Pediatric; D006801:Humans; D016015:Logistic Models; D008297:Male; D015999:Multivariate Analysis; D020380:Needs Assessment; D011237:Predictive Value of Tests; D011446:Prospective Studies; D015203:Reproducibility of Results; D012129:Respiratory Function Tests; D018570:Risk Assessment; D012720:Severity of Illness Index; D013224:Status Asthmaticus / Q000175:diagnosis / Q000188:drug therapy* / Q000453:epidemiology; D016896:Treatment Outcome
chemical_list: D018927:Anti-Asthmatic Agents